.rich-editor {
  height: 100%;
}

.rich-editor.rich-editor-fillHeight .mce-tinymce,
.rich-editor.rich-editor-fillHeight .mce-tinymce>.mce-stack-layout {
  height: 100%;
}

.rich-editor.rich-editor-fillHeight.rich-editor-hasappend .mce-tinymce {
  height: calc(100% - 55px);
}